f3d94cfc23
This reverts commit cad8957eabcbf73062226d28366fd446c15c8737. It breaks NixOps, but more importantly, such major changes to the module system really need to be reviewed.
265 lines
8.7 KiB
Nix
265 lines
8.7 KiB
Nix
# Definitions related to run-time type checking. Used in particular
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# to type-check NixOS configurations.
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with import ./lists.nix;
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with import ./attrsets.nix;
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with import ./options.nix;
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with import ./trivial.nix;
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with import ./strings.nix;
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with {inherit (import ./modules.nix) mergeDefinitions filterOverrides; };
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rec {
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isType = type: x: (x._type or "") == type;
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setType = typeName: value: value // {
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_type = typeName;
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};
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isOptionType = isType "option-type";
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mkOptionType =
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{ # Human-readable representation of the type.
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name
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, # Function applied to each definition that should return true if
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# its type-correct, false otherwise.
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check ? (x: true)
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, # Merge a list of definitions together into a single value.
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# This function is called with two arguments: the location of
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# the option in the configuration as a list of strings
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# (e.g. ["boot" "loader "grub" "enable"]), and a list of
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# definition values and locations (e.g. [ { file = "/foo.nix";
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# value = 1; } { file = "/bar.nix"; value = 2 } ]).
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merge ? mergeDefaultOption
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, # Return a flat list of sub-options. Used to generate
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# documentation.
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getSubOptions ? prefix: {}
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, # List of modules if any, or null if none.
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getSubModules ? null
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, # Function for building the same option type with a different list of
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# modules.
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substSubModules ? m: null
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}:
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{ _type = "option-type";
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inherit name check merge getSubOptions getSubModules substSubModules;
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};
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types = rec {
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unspecified = mkOptionType {
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name = "unspecified";
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};
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bool = mkOptionType {
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name = "boolean";
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check = isBool;
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merge = mergeEqualOption;
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};
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int = mkOptionType {
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name = "integer";
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check = isInt;
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merge = mergeOneOption;
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};
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str = mkOptionType {
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name = "string";
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check = isString;
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merge = mergeOneOption;
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};
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# Merge multiple definitions by concatenating them (with the given
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# separator between the values).
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separatedString = sep: mkOptionType {
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name = "string";
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check = isString;
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merge = loc: defs: concatStringsSep sep (getValues defs);
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};
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lines = separatedString "\n";
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commas = separatedString ",";
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envVar = separatedString ":";
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# Deprecated; should not be used because it quietly concatenates
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# strings, which is usually not what you want.
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string = separatedString "";
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attrs = mkOptionType {
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name = "attribute set";
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check = isAttrs;
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merge = loc: foldl' (res: def: mergeAttrs res def.value) {};
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};
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# derivation is a reserved keyword.
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package = mkOptionType {
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name = "package";
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check = x: isDerivation x || isStorePath x;
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merge = loc: defs:
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let res = mergeOneOption loc defs;
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in if isDerivation res then res else toDerivation res;
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};
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path = mkOptionType {
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name = "path";
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# Hacky: there is no ‘isPath’ primop.
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check = x: builtins.substring 0 1 (toString x) == "/";
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merge = mergeOneOption;
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};
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# drop this in the future:
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list = builtins.trace "`types.list' is deprecated; use `types.listOf' instead" types.listOf;
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listOf = elemType: mkOptionType {
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name = "list of ${elemType.name}s";
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check = isList;
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merge = loc: defs:
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map (x: x.value) (filter (x: x ? value) (concatLists (imap (n: def: imap (m: def':
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(mergeDefinitions
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(loc ++ ["[definition ${toString n}-entry ${toString m}]"])
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elemType
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[{ inherit (def) file; value = def'; }]
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).optionalValue
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) def.value) defs)));
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getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["*"]);
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getSubModules = elemType.getSubModules;
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substSubModules = m: listOf (elemType.substSubModules m);
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};
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attrsOf = elemType: mkOptionType {
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name = "attribute set of ${elemType.name}s";
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check = isAttrs;
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merge = loc: defs:
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mapAttrs (n: v: v.value) (filterAttrs (n: v: v ? value) (zipAttrsWith (name: defs:
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(mergeDefinitions (loc ++ [name]) elemType defs).optionalValue
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)
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# Push down position info.
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(map (def: listToAttrs (mapAttrsToList (n: def':
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{ name = n; value = { inherit (def) file; value = def'; }; }) def.value)) defs)));
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getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name>"]);
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getSubModules = elemType.getSubModules;
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substSubModules = m: attrsOf (elemType.substSubModules m);
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};
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# List or attribute set of ...
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loaOf = elemType:
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let
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convertIfList = defIdx: def:
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if isList def.value then
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{ inherit (def) file;
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value = listToAttrs (
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imap (elemIdx: elem:
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{ name = elem.name or "unnamed-${toString defIdx}.${toString elemIdx}";
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value = elem;
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}) def.value);
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}
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else
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def;
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listOnly = listOf elemType;
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attrOnly = attrsOf elemType;
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in mkOptionType {
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name = "list or attribute set of ${elemType.name}s";
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check = x: isList x || isAttrs x;
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merge = loc: defs: attrOnly.merge loc (imap convertIfList defs);
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getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name?>"]);
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getSubModules = elemType.getSubModules;
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substSubModules = m: loaOf (elemType.substSubModules m);
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};
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# List or element of ...
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loeOf = elemType: mkOptionType {
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name = "element or list of ${elemType.name}s";
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check = x: isList x || elemType.check x;
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merge = loc: defs:
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let
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defs' = filterOverrides defs;
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res = (head defs').value;
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in
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if isList res then concatLists (getValues defs')
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else if lessThan 1 (length defs') then
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throw "The option `${showOption loc}' is defined multiple times, in ${showFiles (getFiles defs)}."
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else if !isString res then
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throw "The option `${showOption loc}' does not have a string value, in ${showFiles (getFiles defs)}."
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else res;
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};
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uniq = elemType: mkOptionType {
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inherit (elemType) name check;
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merge = mergeOneOption;
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getSubOptions = elemType.getSubOptions;
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getSubModules = elemType.getSubModules;
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substSubModules = m: uniq (elemType.substSubModules m);
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};
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nullOr = elemType: mkOptionType {
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name = "null or ${elemType.name}";
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check = x: x == null || elemType.check x;
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merge = loc: defs:
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let nrNulls = count (def: def.value == null) defs; in
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if nrNulls == length defs then null
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else if nrNulls != 0 then
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throw "The option `${showOption loc}' is defined both null and not null, in ${showFiles (getFiles defs)}."
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else elemType.merge loc defs;
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getSubOptions = elemType.getSubOptions;
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getSubModules = elemType.getSubModules;
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substSubModules = m: nullOr (elemType.substSubModules m);
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};
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submodule = opts:
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let
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opts' = toList opts;
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inherit (import ./modules.nix) evalModules;
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in
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mkOptionType rec {
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name = "submodule";
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check = x: isAttrs x || isFunction x;
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merge = loc: defs:
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let
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coerce = def: if isFunction def then def else { config = def; };
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modules = opts' ++ map (def: { _file = def.file; imports = [(coerce def.value)]; }) defs;
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in (evalModules {
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inherit modules;
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args.name = last loc;
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prefix = loc;
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}).config;
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getSubOptions = prefix: (evalModules
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{ modules = opts'; inherit prefix;
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# FIXME: hack to get shit to evaluate.
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args = { name = ""; }; }).options;
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getSubModules = opts';
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substSubModules = m: submodule m;
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};
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enum = values:
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let
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show = v:
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if builtins.isString v then ''"${v}"''
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else if builtins.isInt v then builtins.toString v
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else ''<${builtins.typeOf v}>'';
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in
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mkOptionType {
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name = "one of ${concatMapStringsSep ", " show values}";
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check = flip elem values;
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merge = mergeOneOption;
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};
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either = t1: t2: mkOptionType {
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name = "${t1.name} or ${t2.name}";
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check = x: t1.check x || t2.check x;
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merge = mergeOneOption;
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};
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# Obsolete alternative to configOf. It takes its option
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# declarations from the ‘options’ attribute of containing option
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# declaration.
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optionSet = mkOptionType {
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name = /* builtins.trace "types.optionSet is deprecated; use types.submodule instead" */ "option set";
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};
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# Augment the given type with an additional type check function.
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addCheck = elemType: check: elemType // { check = x: elemType.check x && check x; };
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};
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}
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